CN206887745U - A kind of section assembling FRP using SMA strengthens concrete pier of steel tube - Google Patents

A kind of section assembling FRP using SMA strengthens concrete pier of steel tube Download PDF

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Publication number
CN206887745U
CN206887745U CN201720354685.9U CN201720354685U CN206887745U CN 206887745 U CN206887745 U CN 206887745U CN 201720354685 U CN201720354685 U CN 201720354685U CN 206887745 U CN206887745 U CN 206887745U
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Prior art keywords
frp
sma
steel pipe
concrete
pier
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朱春阳
孙丽
张春巍
刘海成
金峤
孙威
魏明海
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Shenyang Jianzhu University
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Shenyang Jianzhu University
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Abstract

The utility model is related to a kind of FRP using SMA strengthens steel pipe concrete segment assembly pier.It is made up of SMA presstressed reinforcing steels system and FRP enhancing concrete filled steel tube pier shaft two parts.SMA presstressed reinforcing steels system is in series by SMA silk materials or bar with common prestress wire or FRP tendons by connecting plate.FRP enhancing concrete filled steel tube pier shafts are formed by connecting by section.FRP strengthens steel pipe concrete segment and realizes that bayonet joint constructs by misplace arrangement FRP steel pipes and core concrete, wet connection is realized in each section depending on bridge pier using welded still pipe, perfusion core concrete post-cast strip, can also use built-in rubber pad or structure glue and realize that involvement connects by presstressed reinforcing steel.Originally it is new to solve the problems, such as detrusion and section separation at segmental joints under pier stud large deformation, while improve pier stud bottom segment and allow lesion capability, improve the durability of bridge pier.Beneficial to the development of bridge structure assembling, meet the functional requirement of full packaged type bridges under adverse circumstances.

Description

A kind of section assembling FRP using SMA strengthens concrete pier of steel tube
Technical field
The utility model is related to a kind of section assembling FRP using SMA strengthens concrete pier of steel tube, available for assembled In science of bridge building.
Background technology
Fully-prefabricated assembled bridge is not only suitable in the urban viaduct construction that traffic pressure is big, construction site is nervous, Suitable for natural environment is severe, traffic condition is complicated, effective engineering time short high and cold, mountain area, the bridge in the area such as ocean builds In if.Realize that the key of fully-prefabricated assembled bridge is the assembling of bridge substructure, i.e. Bridge Pier.Prestressing force section Assembling technique is a kind of effective means for realizing bridge pier assembling, the technology have speed of application faster, self- recoverage deformability The advantages that residual deformation is small after strong and shake, the Urban Bridge especially suitable for heavy traffic is built, but it is also noted that the bridge Pier there is also some defects, such as the more traditional cast-in-place bridge pier of prestressing force section assembling bridge pier energy dissipation capacity are poor, during large deformation due to Pier shaft axle power cost increases, and bottom segment is easily destroyed, pier stud poor robustness, there is no the theoretical method of maturation can be for reference Deng these deficiencies limit the popularization of prestressing force section assembling bridge pier.
Utility model content
The utility model solves contradiction between traditional prestressing force section assembling bridge pier energy-dissipating property and runback bit function.It is based on SMA super elastic characteristics and the design feature for combining cylinder, there is provided a kind of rational FRP enhancings steel pipe concrete segment form With SMA- presstressed reinforcing steel systems.
The technical solution adopted in the utility model is:
A kind of FRP using SMA strengthens steel pipe concrete segment assembly pier, and SMA- presstressed reinforcing steels system includes anchor Plate, SMA bars, unbonded prestressing tendon, connecting plate;
Anchor slab is connected by nut with SMA bars;SMA bars are connected by nut with connecting plate;Connecting plate passes through nut It is connected with unbonded prestressing tendon;Connecting plate is placed in anchor slab;
SMA bars are more, and SMA bars one end is connected with being fixed on anchor slab in bridge floor, and the other end passes through connecting plate and nothing Binding prestress reinforcement connects, and forms SMA- presstressed reinforcing steel systems;Unbonded prestressing tendon bottom is fixed on pedestal;
Multiple FRP enhancing steel pipe concrete segments are run through with SMA bars and unbonded prestressing tendon and are integrally connected;It is single FRP enhancing steel pipe concrete segments include FRP layers, steel pipe, core concrete, reserved grout hole, presstressed reinforcing steel duct, section contracting Inlet side l1, section external part l2;The steel pipe is presstressed reinforcing steel duct built with core concrete, core concrete center;It is described Steel pipe upper end is provided with reserved grout hole;FRP layers are wound with the outside of steel pipe;
FRP enhancing steel pipe concrete segments are assembled into bridge pier, and bridge pier includes pier shaft, FRP layers, steel pipe, steel pipe seam, coagulation Native seam filler;
Pier shaft center, which is run through, is provided with unbonded prestressing tendon;The steel pipe seam of two steel pipes by the structure that is welded as a whole, The section retraction end l of steel pipe1Pass through concrete joint filler and the section external part l of steel pipe2Connection;In assembled complete pier shaft Outside is provided with FRP layers.
The utility model has the advantages that:
1st, by setting SMA- presstressed reinforcing steel systems, section assembling bridge pier Self-resetting is alleviated using SMA super elastic characteristics Contradiction between power consumption, pier body enhance energy dissipation capacity on the premise of ensureing from runback bit function.
2nd, the combining form feature of FRP enhancing concrete filled steel tubes is taken full advantage of, section bayonet joint is realized, passes through Core concrete, steel pipe stitching position are separately positioned, ensure that the mechanical property of pier body after section assembling.
3rd, by the differently arranged FRP of damaged surface, ensure that the continuity of cylinder after assembly, while pass through tune The design objective of the FRP- steel pipes of whole different parts section, realize the differentiation construction of cylinder difference force part, post Body designability is strong.
Brief description of the drawings
Fig. 1 is SMA- presstressed reinforcing steel system schematics.
Fig. 2 is pier shaft section schematic diagram.
Fig. 3 is bridge pier schematic diagram.
Embodiment
The utility model is further described with reference to Figure of description 1-3 and embodiment.
A kind of FRP using SMA strengthens steel pipe concrete segment assembly pier, utilizes the phase of core concrete and steel pipe Contraposition installs realizes intersegmental bayonet joint surely, and the lesion capability of allowing of section, profit are improved using compound constant concrete Enhancing and anti-corrosion protection after realizing section connection with outside FRP;Bridge pier strengthens steel pipe by SMA- presstressed reinforcing steels system and FRP Concrete segment assembly bridge pier forms.
SMA- presstressed reinforcing steels system includes anchor slab 1-1, SMA bar 1-2, unbonded prestressing tendon 1-3, connecting plate 1;
Anchor slab 1-1 is connected by nut with SMA bars 1-2;SMA bars 1-2 is connected by nut with connecting plate 1;Connection Plate 1 is connected by nut with unbonded prestressing tendon 1-3;Connecting plate 1 is placed in anchor slab 1-1;
SMA bars 1-2 is more, and SMA bar 1-2 one end is connected with being fixed on anchor slab 1-1 in bridge floor, and the other end passes through company Fishplate bar 1 and unbonded prestressing tendon 1-3 connects and composes SMA- presstressed reinforcing steel systems;Unbonded prestressing tendon 1-3 bottoms are fixed on On pedestal;
With SMA bars 1-2 and unbonded prestressing tendon 1-3 by multiple FRP enhancing steel pipe concrete segments through connection one Body;Single FRP enhancing steel pipe concrete segment includes FRP layers 2-1, steel pipe 2-2, core concrete 2-3, reserved grout hole 3, pre- Stress rib duct 3-1, section retraction end l1, section external part l2;The steel pipe 2-2 mixes built with core concrete 2-3, core It is presstressed reinforcing steel duct 3-1 to coagulate native 2-3 centers;The steel pipe 2-2 upper ends are provided with reserved grout hole 3;Wound on the outside of steel pipe 2-2 There is FRP layers 2-1;
FRP enhancing steel pipe concrete segments are assembled into bridge pier, and bridge pier includes pier shaft 2, FRP layers 2-1, steel pipe 2-2, steel pipe and connect Stitch 2-4, concrete joint filler 2-5;
The center of pier shaft 2, which is run through, is provided with unbonded prestressing tendon 1-3;Two steel pipe 2-2 steel pipe seam 2-4 passes through welding It is structure as a whole, the core concrete 2-3 in steel pipe 2-2, steel pipe 2-2 section retraction end l1Filled by concrete joint Thing 2-5 and steel pipe 2-2 section external part l2Connection;FRP layers 2-1 is provided with the assembled complete outside of pier shaft 2.
SMA- presstressed reinforcing steels system uses SMA bars or silk material, passes through connector string with prestress wire or FRP tendons Connection.
SMA silk materials or bar are that SMA material ultimate strength is higher than common presstressed reinforcing steel intensity.
FRP enhancing steel pipe concrete segments form spigot-and-socket using FRP- steel pipes body and core concrete dislocation arrangement Connecting structure.
The adjacent segment of FRP enhancing steel pipe concrete segments can be realized by welded still pipe, perfusion core concrete mortar Wet connection between section, it can also be realized using presstressed reinforcing steel between section by core concrete seam crossing built-in rubber pad, structure glue Involvement connects.
The section link field parcel FRP and the existing FRP in section of FRP enhancing steel pipe concrete segments meet that overlap joint requires.
The pier body surface face entire body parcel FRP of FRP enhancing steel pipe concrete segment assembly bridge piers.
Embodiment
1. prefabricated pier shaft section
(1) pier shaft section form;
The prefabricated subsection post multiple section form, such as circular, rectangle and other odd-shaped cross section forms, are cut with circle Exemplified by the section of face, including FRP- steel pipes and internal core concrete, prefabricated pier shaft section one end, core concrete protrude from The segment distance of composite pipe body edge one;The section other end, the core concrete retraction segment distance of body one;Core concrete is retracted size More than or equal to the protrusion size of other end core concrete;l1Section is retracted end size, l2For section external part size, l1>= l2.Presstressed reinforcing steel duct is set in core concrete, duct runs through core concrete.Optionally at section retraction end Set on barrel and fill (going out) slurry hole.
(2) section spigot-and-socket is assembled;
(a) section is in place:Previous section concrete retraction end is inserted into assembled section concrete protruding end, adjusts each section Relative position, it is ensured that each section prestress pipe insertion.
(b) cylinder joint treatment:After section is in place, each section steel pipe can be welded according to Pier Design functional requirement Connect, or without processing on the premise of steel tube section machining accuracy is ensured, only in seam outer wrap FRP.
(c) concrete joint is handled:Because if the size of section protruding end concrete is less than or equal to retraction end core concrete Retraction size, it is assembled in place after each section core concrete seam region space then be present.Injected hole can be reserved by barrel Non-shrink mortar is irrigated, realizes the continuity of post integral core concrete.The non-shrinkage cement mortar strength is preferably higher than prefabricated Core concrete intensity, position is poured to ensure cylinder after and occurs without weak link.After non-shrinkage cement mortar hardening in good time Carry out barrel grouting eyelet welding and block up operation.When tube wall, which does not use, to be welded to connect, rubber blanket or structure glue can be inserted in seam gaps. Specific processing method is depending on design function requirement.
2.SMA- presstressed reinforcing steel systems
In SMA- presstressed reinforcing steel systems.SMA is used as power consumption and runback bit unit, is arranged at the anchored end of presstressed reinforcing steel, depending on Design requirement is arranged in presstressed reinforcing steel one or both ends.SMA and steel shape are into serial system, SMA length, sectional dimension etc. Geometric parameter is depending on cylinder design limit lateral displacement, and under normal operating condition, SMA- presstressed reinforcing steel systems bear pretension, By adjusting the number of SMA (silk wire rod), SMA can be made to be in design tensile stress state.Under reciprocating load, SMA Realize that cylinder provides power consumption and runback bit function using its super-elasticity.SMA is connected with presstressed reinforcing steel by connector, presstressed reinforcing steel Can use traditional prestress wire, FRP tendons and other similar to presstressed reinforcing steel body.
3. outside FRP
After section assembling is in place, in section, connection field surface arranges FRP in a predefined manner, it is ensured that rearmounted at link field FRP meets lap of splice requirement with the existing FRP in section.After the assembled completion of cylinder, it is ensured that damaged surface entire body covers FRP.
Assembled process:
By taking the welding section assembling cylinder of barrel soldering section assembling cylinder and use rubber blanket as an example, to using SMA- The section assembling formula FRP enhancings steel core concrete column assembly process of pre-stress system illustrates.
There is welding section assembling process as follows:A. the protruding end core concrete insertion section of section (has been spelled when assembled Fill section in place) retraction end.B. steel pipe at section and segmental joints is welded.C. non-shrinkage cement mortar is irrigated, treats its hardening. D., SMA- pre-stress systems are installed, tensioned prestressing bar simultaneously carries out the solid .e. damaged surfaces link field parcel FRP of respective anchors.Splicing Step is as follows:A. rubber blanket is placed in the retraction end of previous section.B. by the protruding end core concrete insertion of section to be installed The retraction end of previous section, and adjust section relative position.C., SMA- pre-stress systems are installed, tensioned prestressing bar simultaneously carries out phase It should anchor.D. damaged surface link field parcel FRP.
The utility model proposes a kind of prestressing force section assembling bridge pier, strengthens concrete filled steel tube by the use of FRP and is saved as assembly Section, and using SMA- presstressed reinforcing steels system as cylinder Self-resetting and dissipative cell.FRP enhancing steel core concrete columns is this new Type high-performance combining structure form, SMA intellectual materials and prestressing force section assembling bridge pier organic combination, correlative study can improve pre- The service behaviour of stress section assembling bridge pier, contribute to the development of full packaged type bridges and assembled combining structure.
FRP enhancing steel core concrete columns are to arrange that FRP sheet materials are formed in a specific way in common steel tube concrete surface A kind of new composite structure post.As a kind of lightweight, high-strength, corrosion resistant high-performance composite materials, FRP introducing can change Kind cylinder mechanical property, by the arrangement for adjusting FRP, it is possible to achieve the designability of cylinder mechanical property.In addition, FRP A kind of anti-corrosion medium also be may be regarded as to protect steel pipe, therefore FRP introducing can also effectively improve the durability of cylinder, with tradition Steel core concrete column compare, FRP enhancing steel core concrete columns are more suitable for the work of the high requirement for anticorrosion such as coastal waters, island In journey works.In terms of cylinder assembling is realized, the combining structure post also has unique advantage:By rationally setting component The configuration mode of material, can be achieved the optimization of means of structural connection, while also help to ensure that the quality of connection of component.
Intellectual material is used as a kind of new function material, has obtained very big development in the research of field of civil engineering, has made The some specific functional requirements of structure can be realized with intellectual material, the damper made using marmem SMA, no matter Active control or passive control are used as, can effectively reduce the dynamic response of structure, improve the anti-seismic performance of structure. Using high-performance combining structure and feature intellectual material, novel pre-stressed section assembling bridge pier is researched and developed, contributes to unit construction bridge The lifting of pier combination property.
Explanation of nouns:SMA (Shape Memory Alloys) marmem, FRP (Fiber Reinforced Polymer) fibre reinforced composites;
The scope of protection of the utility model includes but is not limited to the product and pattern of above-mentioned embodiment, any to meet The pin-connected panel FRP of the utility model claims book strengthens steel core concrete column and any those skilled in the art is to its institute The appropriate change or modification done, should all fall the protection domain in this patent.

Claims (1)

1. a kind of FRP using SMA strengthens steel pipe concrete segment assembly pier, it is characterised in that:
SMA- presstressed reinforcing steels system includes anchor slab, SMA bars, unbonded prestressing tendon, connecting plate;
Anchor slab is connected by nut with SMA bars;SMA bars are connected by nut with connecting plate;Connecting plate passes through nut and nothing Binding prestress reinforcement connects;Connecting plate is placed in anchor slab;
SMA bars are more, and SMA bars one end is connected with being fixed on anchor slab in bridge floor, and the other end passes through connecting plate and soap-free emulsion polymeization Presstressed reinforcing steel connects, and forms SMA- presstressed reinforcing steel systems;Unbonded prestressing tendon bottom is fixed on pedestal;
Multiple FRP enhancing steel pipe concrete segments are run through with SMA bars and unbonded prestressing tendon and are integrally connected;Single FRP Strengthening steel pipe concrete segment includes FRP layers, steel pipe, core concrete, reserved grout hole, presstressed reinforcing steel duct, section retraction Hold l1, section external part l2;The steel pipe is presstressed reinforcing steel duct built with core concrete, core concrete center;The steel Pipe upper end is provided with reserved grout hole;FRP layers are wound with the outside of steel pipe;
FRP enhancing steel pipe concrete segments are assembled into bridge pier, and bridge pier includes pier shaft, FRP layers, steel pipe, steel pipe seam, concrete and connect Stitch filler;
Pier shaft center, which is run through, is provided with unbonded prestressing tendon;The steel pipe seam of two steel pipes passes through the structure that is welded as a whole, steel pipe Section retraction end l1Pass through concrete joint filler and the section external part l of steel pipe2Connection;On the outside of assembled complete pier shaft Provided with FRP layers.
CN201720354685.9U 2017-04-06 2017-04-06 A kind of section assembling FRP using SMA strengthens concrete pier of steel tube Active CN206887745U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107905091A (en) * 2017-04-06 2018-04-13 沈阳建筑大学 A kind of section assembling FRP using SMA presstressed reinforcing steel systems strengthens concrete pier of steel tube
CN110042741A (en) * 2019-03-12 2019-07-23 中国矿业大学 A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107905091A (en) * 2017-04-06 2018-04-13 沈阳建筑大学 A kind of section assembling FRP using SMA presstressed reinforcing steel systems strengthens concrete pier of steel tube
CN107905091B (en) * 2017-04-06 2019-09-13 沈阳建筑大学 A kind of section assembling FRP enhancing concrete pier of steel tube using SMA- presstressed reinforcing steel system
CN110042741A (en) * 2019-03-12 2019-07-23 中国矿业大学 A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method

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